iOS Software Engineer Intern

Join Proton and build a better internet where privacy is the default

Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then, we’ve built the world’s largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar—tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In some situations, Proton has literally helped save lives.

We are profitable, independent (no VC control), and selectively hire from the top ~1% of applicants. Our 500+ team members across 50+ countries come from leading organisations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritise impact over optics. If you want to do meaningful work with exceptionally high-caliber people, this is it. Join us and do work you can truly be proud of. Check our open-source projects here!

The Role

We’re looking for an iOS Developer Intern to help build and launch a brand-new iOS application from the ground up. You’ll work closely with senior iOS engineers, a product manager, and a designer to develop and iterate on core features using SwiftUI and The Composable Architecture (TCA). This internship offers real ownership of well-scoped features, hands-on experience preparing an app for public release, and exposure to best practices for shipping production-ready iOS apps. You’ll contribute to a product tackling meaningful privacy challenges, particularly in areas impacting women’s digital privacy with the potential to reach 100+ million users.

What you will do:

• Contribute to the development and launch of a brand-new iOS application
• Build and iterate on core product features using TCA, SwiftUI
• Take ownership of well-scoped features with real impact on the final product
• Help prepare the app for public release, including testing, polishing, and performance improvements
• Participate in code reviews and learn best practices for shipping production-ready iOS apps
• Work on a product designed to address meaningful privacy challenges, including areas impacting women’s digital privacy

What we are looking for: 

• Solid understanding of Swift
• Basic familiarity with SwiftUI and TCA
• Experience building at least one iOS app or feature (school, personal, or hobby)
• Ability to use Xcode and run/debug on simulator or device
• Confortable with version control (Git)
• Good communication and collaboration skills
• Interest in privacy, security, or user trust

Nice to have:

• Having shipped or published a personal app (TestFlight or App Store)
• Basic experience writing unit tests or UI tests
• Understanding of networking layers (URLSession, handling errors, retries)
• Ability to measure performance or track crashes (Xcode instruments, basics)

What We Offer

• Office First: Collaboration is easier and more effective in person, which is why we have offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei. You can also enjoy working from home up to 30% of the time, while enjoying great company during our three core days in the office. 
• Technology: We provide all the devices and software you need to excel in your role, ensuring you have the best tools at your disposal to achieve your goals.
• Food: Lunch and snacks are provided by Proton every day at our offices.
• Transport: We will always support our employees with transport costs through subsidizing public transport, bike allowances, or parking spaces based on your office location.
• Stock Options: At Proton, we are all owners of the company and you get stock options when you join us.
• Flexible Working: You can define your own working hours as long as it works with team meetings.
• Learning and Development: We are committed to your professional growth. Proton offers various learning opportunities, including training programs, conferences and events, and continual learning.
• Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacation and leave policies, and wellness programs.
• Work that Matters: Proton is a community-first organization, started with the support of a crowdfunding campaign and built with community input. To this day, Proton’s only source of revenue is user subscriptions. Over 100 million people trust and support Proton, and we put our users and community first in everything we do. Read more about our impact here.

Our Commitment to Diversity and Inclusion

At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual orientation, physical ability, or socio-economic background, feel valued and empowered. We strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected.

If you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know.

Candidate Privacy Notice

When you apply for a position, refer a candidate, or are considered for a role at Proton Technologies AG (Proton, we, us, or our), your information is stored in Greenhouse, in accordance with their Service Privacy Policy. This information is used to evaluate your suitability for the posted position. We also retain this information for consideration for future roles that you may apply for or that we believe may align with your background and skills.

If we no longer have a legitimate business need to process your information, we will either delete or anonymize it. Should you have any inquiries about how we use or manage your information, or if you wish to access, correct, or delete your data, please contact our privacy team at careers@proton.ch.

Proton does not accept unsolicited resumes from any sources other than directly from candidates. We will not pay a fee for any placement resulting from an unsolicited offer, even if the candidate is subsequently hired by Proton.

To learn more about our privacy policy, please visit our privacy policy page.

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